Screwdriver bit



FIG. 1 is a front-right-top perspective view of a screwdriver bit, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof, the right side view being a mirror image thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a perspective view of the screwdriver bit, wherein the broken line showing of the screwdriver is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a screwdriver bit, as shown and described. 